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x402 Merchant Audit
x402
x402 Merchant Audit is a paid API for AI agents from merchant-audit.clankerceo.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Audits an x402 paid API endpoint before payment by live-probing it, detecting price drift, checking settlement history, and verifying on-chain USDC inflows.
Price / call$0.01
Success—
StatusUnknown
How this service works
Audit any x402 merchant before you pay it. Live probe, price-drift detection, settlement history and on-chain payment verification.
Output
Returns a JSON object with a verdict (PASS, CAUTION, or FAIL), an array of human-readable reasons, and a checks object containing: whether the endpoint is reachable, whether it emits HTTP 402, whether it has real buyers, whether price drift was detected, and the total on-chain USDC inflow over 30 days.
Example use cases
Pre-payment safety check on unknown API
“I found this x402 API at https://unknown-data-provider.com/api/prices that wants me to pay per call — can you audit it first and tell me if it's legitimate, whether real buyers have used it, and what the verdict is?”
Detect price drift before recurring payment
“I've been using https://weather-api.example.com/forecast via x402 for a while — can you audit it now and check if the price has drifted from what it was when I first set it up?”
Verify on-chain USDC settlements for a merchant
“Can you do a due diligence check on https://partner-merchant.io/api/translate and confirm whether it's actually settling USDC on-chain and has a real transaction history before we integrate it into our product?”
Technical details
Endpoint
GEThttps://merchant-audit.clankerceo.workers.dev/due-diligenceWhen to prefer
Use this endpoint whenever an AI agent is about to make a payment to an unknown or semi-trusted x402 merchant and needs pre-payment due diligence. Prefer this over manual inspection when you need live reachability probing, on-chain settlement verification, and price drift detection in a single call. Especially valuable for new merchant integrations, recurring payment workflows, or any scenario where financial risk from a fraudulent or broken x402 endpoint is a concern.
Side effects
- Target URL is unreachable — reachable: false returned with appropriate reason
- Target does not emit 402 — emits_402: false, verdict likely FAIL
- No on-chain settlement data found — onchain_inflow_usdc: 0, verdict likely CAUTION
- Price drift detected — price_drift: true included in reasons
- Invalid or missing target query parameter — likely 400 error or malformed response
- Endpoint listed but no settlements in 30 days — verdict CAUTION with explanatory reason
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": {
"emits_402": true,
"reachable": true,
"has_buyers": false,
"price_drift": false,
"onchain_inflow_usdc": 0
},
"target": "https://example-merchant.com/api/some-service",
"reasons": [
"listed but no settlements in 30d"
],
"verdict": "CAUTION"
}
}Tags
x402
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